A RECONNAISSANCE STUDY OF THE EFFECT OF IRRIGATED AGRICULTURE ON WATER QUALITY IN THE OGALLALA FORMATION, CENTRAL HIGH PLAINS AQUIFER -- Figure 3

Figure 1. (A) Location of the High Plains aquifer. The portion of the Central High Plains aquifer composed of sediments of the Ogallala Formation is outlined in black. (B) Location of irrigated cropland and monitoring wells in the Ogallala Formation, Central High Plain aquifer.